Color-photographic recording material

ABSTRACT

The invention relates to a color-photographic recording material which comprises a magenta coupler and, as stabilizer, at least one compound of formula (Ia), (Ib) or (II), where the radicals are as defined in claim 1, and to the novel stabilizers.

The present invention relates to a novel colour-photographic recording material which contains a magenta coupler and, as stabilizer, an N-heterocyclylphenyl compound, and to novel N-heterocyclylphenyl compounds.

The alkylated hydroquinone ethers or diethers used hitherto as stabilizers in photographic materials exhibited inadequate activity, in particular in the case of 1H-pyrazolo- 5,1-c! 1,2,4!triazole magenta couplers (see also structure C-5).

A group of N-heterocyclylphenyl compounds has now been found which, surprisingly, has proved substantially free from such disadvantages. In addition, they are also suitable as coupler oils and thus facilitate a simplified incorporation of the couplers. In particular, this group of N-heterocyclylphenyl compounds is suitable for increasing the stability of magenta dyes in colour-photographic materials.

The novel stabilizers can be used for all types of photosensitive materials. For example, they can be employed for colour paper, colour reversal paper, direct-positive colour material, colour negative film, colour positive film, colour reversal film, etc. They are preferably used, inter alia, for photosensitive colour material which contains a reversal substrate or forms positives.

Colour-photographic recording materials usually contain, on a support, a blue-sensitive and/or a green-sensitive and/or a red-sensitive silver-halide emulsion layer and, if desired, a protection layer, the stabilizer for the magenta dye being in the green-sensitive layer.

The present application thus relates to a colour-photographic recording material which contains a magenta coupler and, as stabilizer, at least one compound of the formula ##STR1## where k is the number 0 or 1;

p is a number from 1 to 18;

R₁ is hydrogen, C₁ -C₁₂ alkyl, C₁ -C₁₂ alkoxy, --COR₉, --COOR₁₀ or --Si(R₁₁)(R₁₂)(R₁₃);

in which R₉ is C₁ -C₈ alkyl, C₂ -C₁₈ alkenyl or phenyl;

R₁₀ is C₁ -C₄ alkyl or benzyl; and

R₁₁, R₁₂ and R₁₃, independently of one another, are C₁ -C₆ alkyl or phenyl;

R₂ is hydrogen, C₁ -C₁₈ alkyl, --OR₁₄ or --(CH₂)_(n) COOR₁₅ ;

in which n is a number from 0 to 17;

R₁₄ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, phenyl-C₁ -C₄ alkyl, C₃ -C₂₄ alkyl which is interrupted by one or more --O-- atoms, C₂ -C₁₄ hydroxyalkyl, phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen, or is tolyl, C₅ -C₆ cycloalkyl or --COR₁₆ ;

R₁₅ is C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl or phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen;

in which R₁₆ is C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl or phenyl;

R₃, R₄, R₅ and R₆, independently of one another, are hydrogen, C₁ -C₁₂ alkyl, C₁ -C₈ alkoxy, C₅ -C₇ cycloalkyl, phenyl, phenyl-C₁ -C₄ alkyl or halogen; R₇ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, phenyl-C₁ -C₄ alkyl, C₃ -C₂₄ alkyl, which is interrupted by one or more --O-- atoms, phenyl-C₁ -C₄ alkyl, phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen, or is benzyl, a group of the formula ##STR2## --CH₂ COOR₂₃ or --(CH₂ COO)_(k) CH₂ CH(OR₁)CH₂ R₁₇ ;

in which k is the number 0 or 1;

m is a number from 1 to 17;

R₁₇ is as defined for R₂ or is a group of the formula ##STR3## and R₂₃ is C₁ -C₈ alkyl;

R₈ is hydrogen, C₁ -C₁₈ alkyl or CH₂ R₂ ; R₂₄ is --Si(R₁₁)(R₁₂)(R₁₃) or a group of the formula ##STR4## in which q is a number from 0 to 12; and R₂₅ is hydrogen or C₁ -C₁₈ alkyl;

X₁ is O, S, SO, SO₂ or NR₁₈ ;

in which R₁₈ is hydrogen, C₁ -C₁₈ alkyl, --CH₂ CH(OH)CH₂ O(C₁ -C₁₄ alkyl) or --CO--R₁₉ ;

in which R₁₉ is C₁ -C₁₈ alkyl; and

X₂ is CO, BR₂₀, PR₂₁, P(O)R₂₂, SO or SO₂ ;

in which R₂₀, R₂₁, and R₂₂ are C₁ -C₁₈ alkyl or phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen; and

R₂₁ and R₂₂ may alternatively be phenoxy, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen;

where, in the case of compounds of the formula (Ia) R₂ may alternatively be a group of the formula ##STR5##

Any C₁ -C₁₈ alkyl substituents in the compounds according to the invention are radicals such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tetradecyl, hexadecyl and octadecyl, and corresponding branched isomers.

C₅ -C₇ cycloalkyl radicals are, for example, cyclopentyl, cyclohexyl or cycloheptyl.

Alkyl radicals having 3 to 24 carbon atoms which are interrupted by oxygen are, for example, ##STR6##

Alkenyl radicals having 2 to 18 carbon atoms may be monounsaturated or, from 4 carbon atoms, polyunsaturated, for example, 1-propenyl, allyl, methallyl, 2-butenyl, 2-pentenyl, 2-hexenyl, 2-octenyl, 4-tert-butyl-2-butenyl or radicals derived from the above alkyl radicals.

C₁ -C₁₂ alkoxy radicals are, for example, methoxy, ethoxy, propoxy, butoxy or hexoxy and corresponding branched isomers.

Phenyl-C₁ -C₄ alkyl radicals are, for example, benzyl or cumyl.

C₂ -C₁₄ hydroxyalkyl radicals are, for example, 2-hydroxyethyl, 2-hydroxypropyl, 3-hydroxypropyl, 2-hydroxybutyl or 4-hydroxybutyl.

Halogen radicals are, for example, fluorine, chlorine, bromine or iodine. Preferably, halogen is chlorine.

Preferably, R₁ is hydrogen.

Preferably, R₂ is C₁ -C₁₈ alkyl or --OR₁₄ ;

in which R₁₄ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₃ -C₂₄ alkych is interrupted by one or more --O-- atoms, phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl or C₁ -C₄ alkoxy, or is tolyl or C₅ -C₆ cycloalkyl;

and, in the case of compounds of the formula (Ia), may alternatively be a group of the formula ##STR7##

Preferably, R₃, R₄, R₅ and R₆, independently of one another, are hydrogen, C₁ -C₁₂ alkyl or C₁ -C₈ alkoxy; and most preferably R₃, R₄, R₅ and R₆ are hydrogen.

Preferably, R₇ is C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, a group of the formula ##STR8## --CH₂ COOR₂₃ or --(CH₂ COO)_(k) CH₂ CH(OR₁)CH₂ R₁₇ ;

in which k is the number 0 or 1;

m is a number from 1 to 17;

R₁₇ is as defined for R₂ or is a group of the formula ##STR9## and R₂₃ is C₁ -C₈ alkyl.

Preferably, R₈ is hydrogen, C₁ -C₈ alkyl or CH₂ R₂.

Preferably, R₂₄ is --Si(R₁₁)(R₁₂)(R₁₃) or a group of the formula ##STR10## in which q is a number from 0 to 6; R₁₁, R₁₂ and R₁₃, independently of one another, are C₁ -C₆ alkyl or phenyl; and

R₂₅ is hydrogen or C₁ -C₁₈ alkyl.

Preferably, X₁ is O, S, SO, SO₂ or NR₁₈ ;

in which R₁₈ is --CH₂ CH(OH)CH₂ O(C₁ -C₁₄ alkyl);

and most preferably X₁ is O or SO₂.

Preferably, X₂ is CO, BR₂₀, PR₂₁ or P(O)R₂₂ ;

in which R₂₀, R₂₁ and R₂₂ are phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, or C₁ -C₄ alkoxy; and

R₂₁ and R₂₂ may alternatively be phenoxy, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl or C₁ -C₄ alkoxy;

and most preferably X₂ is P(O)R₂₂ in which R₂₂ is phenyl or phenoxy.

Preference is given to compounds of the formulae (Ia), (Ib) or (II),

where

k is the number 0 or 1;

p is a number from 2 to 12;

R₁ is hydrogen;

R₂ is C₁ -C₁₈ alkyl or --OR₁₄ ;

in which R₁₄ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₃ -C₂₄ alkyl which is interrupted by one or more --O-- atoms, phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl or C₁ -C₄ alkoxy, or is tolyl or C₅ -C₆ cycloalkyl;

R₃, R₄, R₅ and R₆, independently of one another, are hydrogen, C₁ -C₁₂ alkyl or C₁ -C₈ alkoxy;

R₇ is C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, a group of the formula ##STR11## --CH₂ COOR₂₃ or --(CH₂ COO)_(k) CH₂ CH(OR₁)CH₂ R₁₇ ;

in which k is the number 0 or 1;

m is a number from 1 to 17;

R₁₇ is as defined for R₂ or is a group of the formula ##STR12## and R₂₃ is C₁ -C₈ alkyl;

R₈ is hydrogen, C₁ -C₈ alkyl or CH₂ R₂ ;

R₂₄ is --Si(R₁₁)(R₁₂)(R₁₃) or a group of the formula ##STR13## in which q is a number from 0 to 6; R₁₁, R₁₂ and R₁₃, independently of one another, are C₁ -C₆ alkyl or phenyl; and

R₂₅ is hydrogen or C₁ -C₁₈ alkyl;

X₁ is O, S, SO, SO₂ or NR₁₈ ;

in which R₁₈ is --CH₂ CH(OH)CH₂ O(C₁ -C₁₄ alkyl); and

X₂ is CO, BR₂₀, PR₂₁ or P(O)R₂₂ ;

in which R₂₀, R₂₁ and R₂₂ are phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl or C₁ -C₄ alkoxy; and

R₂₁, and R₂₂ may alternatively be phenoxy, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl or C₁ -C₄ alkoxy;

where, in the case of compounds of the formula (Ia), R₂ may alternatively be a group of the formula ##STR14##

Particular preference is given to compounds of the formulae (Ia), (lb) and (II) which have a melting point of below 60° C. or are liquid at room temperature. These compounds can be employed as photographic oil or partly replace the photographic oil.

Of particular importance are compounds of the formula (Ia), (lb) or (II),

where

k is the number 0;

p is a number from 2 to 12;

R₁ is hydrogen;

R₂ is --OR₁₄ ;

in which R₁₄ is C₁ -C₁₈ alkyl, C₃ -C₂₄ alkyl which is interrupted by one or more --O-- atoms, or phenyl;

R₃, R₄, R₅ and R₆ are hydrogen;

R₇ is C₁ -C₁₈ alkyl or --(CH₂ COO)_(k) CH₂ CH(OR₁)CH₂ R₁₇ ;

in which k is the number 0; and

R₁₇ is as defined for R₂ ;

R₈ is hydrogen or CH₂ R₂ ;

R₂₄ is a group of the formula ##STR15## in which q is a number from 0 to 6; and R₂₅ is hydrogen or C₁ -C₁₈ alkyl;

X₁ is O or SO₂ ; and

X₂ is P(O)R₂₂ ;

in which R₂₂ is phenyl or phenoxy.

Very particular preference is given to compounds of the formula (Ia) or (II),

where

k is the number 0;

R₁ is hydrogen;

R₂ is --OR₁₄ ;

in which R₁₄ is C₁ -C₁₄ alkyl or phenyl;

R₃, R₄, R₅ and R₆ are hydrogen;

R₇ is C₁ -C₁₈ alkyl;

R₈ is hydrogen or CH₂ R₂ ;

X₁ is O or SO₂ ; and

X₂ is P(O)R₂₂ ;

in which R₂₂ is phenyl or phenoxy.

The novel material preferably contains gelatin interlayers between the silver-halide emulsion layers.

Preference is given to photographic materials of this type in which the silver-halide in the blue-sensitive and/or green-sensitive and/or red-sensitive layer is silver chloride bromide comprising at least 90 mol % of silver chloride.

Preference is furthermore given to photographic materials which contain the silver-halide emulsion layers in the sequence blue-sensitive, green-sensitive and red-sensitive layers.

Typical and preferred stabilizers according to the invention are the following: ##STR16##

In the above compounds, "Ph" is a phenyl radical and "C₁₂ H₂₅ /C₁₃ H₂₇ /C₁₄ H₂₉ *" stands for a mixture of dodecyl, tridecyl and tetradecyl radicals.

In general, the novel stabilizers are used in from 0.1 to 4 times, preferably from 0.2 to 2 times, the amount by weight relative to the colour coupler used together with them.

The magenta couplers in the colour-photographic recording material can be, for example, simple 1-aryl-5-pyrazolones or pyrazole derivatives which are fused to 5-membered heterocyclic rings, eg. imidazopyrazoles, pyrazolopyrazoles, pyrazolotriazoles or pyrazolotetrazoles.

A group of magenta couplers comprises 5-pyrazolones of the formula C ##STR17## as described in British Patent 2 003 473. In this formula, R₁₆ is hydrogen, alkyl, aryl, alkenyl or a heterocyclic group. R₁₇ is hydrogen, alkyl, aryl, a heterocyclic group, an ester group, an alkoxy group, an alkylthio group, a carboxyl group, an arylamino group, an acylamino group, a (thio)urea group, a (thio)carbamoyl group, a guanidino group or a sulfonamido group.

R₁₇ is preferably a ##STR18## group, in which R₁₈ is imino, acylamino or ureido, R₁₉ is hydrogen, halogen, alkyl or alkoxy, R₂₀ is hydrogen, alkyl, acylamino, carbamoyl, sulfamoyl, sulfonamido, alkoxycarbonyl, acyloxy or a urethane group.

If Q' is hydrogen, the magenta coupler is tetraequivalent with respect to the silver halide.

Preferred examples of magenta couplers of this type are compounds of the formula ##STR19## in which R₂₀ is as defined above, and Q', as described above, is a leaving group. These compounds are preferably present in the material according to the invention.

Further examples of tetraequivalent magenta couplers of this type are given in U.S. Pat. Nos. 2,983,608, 3,061,432, 3,062,653, 3,127,269, 3,152,896, 3,311,476, 3,419,391, 3,519,429, 3,558,319, 3,582,322, 3,615,506, 3,684,514, 3,834,908, 3,888,680, 3,891,445, 3,907,571, 3,928,044, 3,930,861, 3,930,866 and 3,933,500 and JP-A 89/309 058.

If Q' in the formula C is not hydrogen, but instead a group which is eliminated during the reaction with the oxidized developer, the magenta coupler is diequivalent. In this case, Q can be, for example, halogen or a group bonded to the pyrazole ring via O, S or N. Diequivalent couplers of this type give greater colour density and are more reactive towards the oxidized developer than are the corresponding tetraequivalent magenta couplers.

Examples of diequivalent magenta couplers are described in U.S. Pat. Nos. 3,006,579, 3,419,391, 3,311,476, 3,432,521, 3,214,437, 4,032,346, 3,701,783, 4,351,897, 3,227,554, in EP-A 133 503, DE-A 2 944 601, JP-A 78/34 044, 74/53 435, 74/53 436, 75/53 372 and 75/122 935.

Typical and preferred magenta couplers conform to the formulae: ##STR20##

It is possible for 2 pyrazolone rings to be linked via a divalent Q', giving so-called bis-couplers. These are described, for example, in U.S. Pat. No. 2,632,702, U.S. Pat. No.2,618,864, GB-A 968 461, GB-A 786 859, JP-A 76/37 646, 59/4086, 69/16 110, 69/26 589, 74/37 854 and 74/29 638. Y is preferably an O-alkoxyarylthio group.

As mentioned above, the magenta couplers used can also be pyrazoles fused to 5-membered heterocyclic rings, known as pyrazoloazoles. Their advantages over simple pyrazoles are that they give dyes of greater formalin resistance and have purer absorption spectra.

Magenta couplers of the pyrazoloazole type, which are likewise preferred, may be represented by the formula ##STR21## in which R₁ is hydrogen or a substituent, Z represents the non-metallic atoms necessary to complete a 5-membered ring containing 2 or 3 nitrogen atoms, it being possible for this ring to be substituted, and Q is hydrogen or a leaving group.

Of these compounds, preference is given to magenta couplers of the formulae ##STR22##

R₁₁, R₁₂ and R₁₃, independently of one another, are, for example, hydrogen, halogen, --CR₃ in which the radicals R, independently of one another, are hydrogen or alkyl, aryl, heterocyclyl, cyano, hydroxyl, nitro, carboxyl, amino, alkoxy, aryloxy, acylamino, alkylamino, anilino, ureido, sulfamoylamino, alkylthio, arylthio, alkoxycarbonylamino, sulfonamido, carbamoyl, sulfamoyl, sulfonyl, alkoxycarbonyl, heterocyclyloxy, azo, acyloxy, carbamoyloxy, silyloxy, aryloxycarbonylamino, imido, heterocyclylthio, sulfinyl, phosphonyl, aryloxycarbonyl, acyl or azolyl, preferably hydrogen, halogen (for example chlorine or bromine), --CR₃ in which the radicals R₃, independently of one another, are hydrogen or alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl or cycloalkenyl, particularly preferably methyl, ethyl, propyl, isopropyl, t-butyl, tridecyl, 2-methanesulfonylethyl, 3-(3-pentadecylphenoxy)propyl, 3-(4-(2-(4-(4-hydroxyphenylsulfonyl)phenoxy)dodecanamido)phenyl)propyl, 2-ethoxytridecyl, trifluoromethyl, cyclopentyl, 3-(2,4-di-t-amylphenoxy)propyl; aryl (for example phenyl, 4-t-butylphenyl, 2,4-di-t-amylphenyl or 4-tetradecanamidophenyl); heterocyclyl (for example 2-furyl, 2-thienyl, 2-pyrimidinyl or 2-benzothiazolyl); cyano; hydroxyl, nitro; carboxyl; amino; alkoxy (for example methoxy, ethoxy, 2-methoxyethoxy; 2-dodecylethoxy, 2-methanesulfonylethoxy); aryloxy (for example phenoxy, 2-methylphenoxy, 4-t-butylphenoxy, 3-nitrophenoxy, 3-t-butyloxycarbamoylphenoxy or 3-methoxycarbamoyl); acylamino (for example acetamido, benzamido, tetradecanamido, 2-(2',4-di-t-amylphenoxy)butanamido, 4-(3-t-butyl-4-hydroxyphenoxy)butanamido, 2-(4-(4-hydroxyphenylsulfonyl)phenoxy)decanamido or methylbutylamino); anilino (for example phenylamino, 2-chloroanilino, 2-chloro-5-tetradecanaminoanilino, 2-chloro-5-dodecyloxycarbonylanilino, N-acetylanilino, 2-chloro-5-(alpha-(3-t-butyl-4-hydroxyphenoxy)dodecanamidoanilino); ureido (for example phenylureido, methylureido or N,N-dibutylureido); sulfamoylamino (for example N,N-dipropylsulfamoylamino or N-methyl-N-decylsulfamoylamino); alkylthio (for example methylthio, octylthio, tetradecylthio, 2-phenoxyethylthio, 3-phenoxypropylthio or 3-(4-t-butylphenoxy)propylthio); arylthio (for example phenylthio, 2-butoxy-5-t-octylphenylthio, 3-pentadecylphenylthio, 2-carboxyphenylthio or 4-tetradecanamidophenylthio); alkoxycarbonylamino (for example methoxycarbonylamino or tetradecyloxycarbonylamino); sulfonamido (for example methanesulfonamido, hexadecanesulfonamido, benzenesulfonamido, p-toluenesulfonamido, octadecanesulfonamido or 2-methoxy-5-t-butylbenzenesulfonamido); carbamoyl (for example N-ethylcarbamoyl, N,N-dibutylcarbamoyl, N-(2-dodecyloxyethyl)carbamoyl, N-methyl-N-dodecylcarbamoyl or N-(3-(2,4-di-t-amylphenoxy)propyl)carbamoyl); sulfamoyl (for example N-ethylsulfamoyl, N,N-dipropylsulfamoyl, N-2-(dodecyloxyethyl)sulfamoyl, N-ethyl-N-dodecylsulfamoyl or N,N-diethylsulfamoyl); sulfonyl (for example methanesulfonyl, octanesulfonyl, benzenesulfonyl or toluenesulfonyl); alkoxycarbonyl (for example methoxycarbonyl, butoxycarbonyl, dodecyloxycarbonyl or octadecyloxycarbonyl); heterocyclyloxy (for example 1-phenyltetrazol-5-oxy or 2-tetrahydropyranyloxy); azo (for example phenylazo, 4-methoxyphenylazo, 4-pivaloylaminophenylazo or 2-hydroxy-4-propanoylphenylazo); acyloxy (for example acetoxy); carbamoyloxy (for example N-methylcarbamoyloxy or N-phenylcarbamoyloxy); silyloxy (for example trimethylsilyloxy or dibutylmethylsilyloxy); aryloxycarbonylamino (for example phenoxycarbonylamino); imido (for example N-succinimido, N-phthalimido or 3-octadecenylsuccinimido); heterocyclylthio (for example 2-benzothiazolylthio, 2,4-diphenyloxy-1,3,5-triazole-6-thio or 2-pyridylthio); sulfinyl (for example dodecanesulfmyl, 3-pentadecylphenylsulfinyl or 3-phenoxypropylsulfinyl); phosphonyl (for example phenoxyphosphonyl, octyloxyphosphonyl or phenylphosphonyl); aryloxycarbonyl (for example phenoxycarbonyl); acyl (for example acetyl, 3-phenylpropanoyl, benzoyl or 4-dodecyloxybenzoyl); or azolyl (for example imidazolyl, pyrazolyl or 3-chloropyrazol-1-yl).

These substituents may be further substituted, for example by halogen or by an organic radical bonded via a C, O, N or S atom.

Preferred groups R₁₁ are alkyl, aryl, alkoxy, aryloxy, alkylthio, ureido, urethane and acylamino groups.

R₁₂ may be as defined for R₁₁ and is preferably hydrogen, alkyl, aryl, a heterocyclic ring, alkoxycarbonyl, carbamoyl, sulfamoyl, sulfinyl, acyl or cyano.

R₁₃ may be as defined for R₁₁ and is preferably hydrogen, alkyl, aryl, a heterocyclic ring, alkoxy, aryloxy, alkylthio, arylthio, alkoxycarbonyl, carbamoyl or acyl, in particular alkyl, aryl, a heterocyclic ring, alkylthio or arylthio.

Q is hydrogen or a leaving group, such as halogen, alkoxy, aryloxy, acyloxy, alkyl- or arylsulfonyloxy, acylamino, alkyl- or arylsulfonamido, alkoxycarbonyloxy, aryloxycarbonyloxy, alkyl-, aryl- or heterocyclyl-S-carbamoylamino, a 5- or 6-membered, nitrogen-containing heterocyclic radical, imido or arylazo. These groups may be further substituted as indicated for R₁₁.

Q is preferably halogen (for example fluorine, chlorine or bromine); alkoxy (for example ethoxy, dodecyloxy, methoxyethylcarbamoylmethoxy, carboxypropoxy, methylsulfonylethoxy, or ethoxycarbonylmethoxy); aryloxy (for example 4-methylphenoxy, 4-chlorophenoxy, 4-methoxyphenoxy, 4-carboxyphenoxy, 3-ethoxycarboxyphenoxy, 3-acetylaminophenoxy or 2-carboxyphenoxy); acyloxy (for example acetoxy, tetradecanoyloxy or benzoyloxy); alkyl- or arylsulfonyloxy (for example methanesulfonyloxy or toluenesulfonyloxy); acylamino (for example dichloroacetylamino or heptafluorobutyrylamino); alkyl- or arylsulfonamido (for example methanesulfonamido, trifluoromethanesulfonamido or p-toluenesulfonamido); alkoxycarbonyloxy (for example ethoxycarbonyloxy or benzyloxycarbonyloxy); aryloxycarbonyloxy (for example phenoxycarbonyloxy); alkyl-, aryl- or heterocyclyl-S-(for example dodecylthio, 1-carboxydodecylthio, phenylthio, 2-butoxy-5-t-octylphenylthio or tetrazolylthio); carbamoylamino (for example N-methylcarbamoylamino or N-phenylcarbamoylamino); a 5- or 6-membered, nitrogen-containing ring (for example imidazolyl, pyrazolyl, triazolyl, tetrazolyl or 1,2-dihydro-2-oxo-1-pyridyl); imido (for example succinimido or hydantoinyl); or arylazo (for example phenylazo or 4-methoxyphenylazo).

Q may alternatively form corresponding bis-compounds by condensation of 4 equivalents of coupler with an aldehyde or ketone. Furthermore, Q may contain photographically active groups, such as development inhibitors or development accelerators. Q is preferably halogen, alkoxy, aryloxy, alkyl- or arylthio, or a 5- or 6-membered, nitrogen-containing, heterocyclic group which is bonded to the coupling site via a nitrogen atom.

Pyrazolotetrazoles are described in JP-A 85/33 552; pyrazolopyrazoles in JP-A 85/43 695; pyrazoloimidazoles in JP-A 85/35 732, JP-A 86/18 949 and U.S. Pat. No. 4,500,630; pyrazolotriazoles in JP-A 85/186 567, JP-A 86/47 957, JP-A 85/215 687, JP-A 85/197 688, JP-A 85/172 982, EP-A 119 860, EP-A 173 256, EP-A 178 789, EP-A 178 788 and in Research Disclosure 84/24 624.

Further pyrazoloazole magenta couplers are described in: JP-A 86/28 947, JP-A 85/140 241, JP-A 85/262 160, JP-A 85/213 937, JP-A 87/278 552, JP-A 87/279 340, JP-A 88/100 457, EP-A 177 765, EP-A 176 804, EP-A 170 164, EP-A 164 130, EP-A 178 794, DE-A 3 516 996, DE-A 3 508 766 and Research Disclosure 81/20 919, 84/24 531 and 85/25 758.

Examples of suitable couplers of this type are: ##STR23##

Yellow couplers which can be used in the material according to the invention are preferably compounds of the formula A ##STR24## in which R₁ is alkyl or aryl, R₂ is aryl and Q is hydrogen or a group which can be eliminated by reaction with the oxidized developer.

A group of yellow couplers comprises the compounds of the formula A in which R₁ is t-butyl and R₂ is a group of the formula ##STR25## in which R₃ is hydrogen, halogen, alkyl or alkoxy, and R₄, R₅ and R₆ are hydrogen, halogen, alkyl, alkenyl, alkoxy, aryl, carboxyl, alkoxycarbonyl, carbamoyl, sulfonyl, sulfamoyl, alkylsulfonamido, acylamino, ureido or amino.

Preferably, R₃ is chlorine, R₄ and R₅ are hydrogen and R₆ is an acylamino group. This group also includes the compounds of the formula ##STR26## in which x is 0-4, R₇ is hydrogen or alkyl, and R₈ and R₉ are alkyl.

Another group of yellow couplers conforms to the formula B ##STR27## in which R₁₀ is hydrogen, halogen or alkoxy, R₁₁, R₁₂ and R₁₃ are hydrogen, halogen, alkyl, alkenyl, alkoxy, aryl, carboxyl, alkoxycarbonyl, carbamoyl, sulfonyl, sulfamoyl, sulfonamido, acylamino, ureido or amino, and R₁ and Q are as defined above.

This group includes compounds of the formula B in which R₁ is t-butyl, R₁₀ is chlorine, R₁₁ and R₁₃ are hydrogen, and R₁₂ is alkoxycarbonyl.

In the compounds of the formulae A and B, leaving group Q may be hydrogen or a heterocyclic group ##STR28## in which R₁₄ is a divalent organic group which supplements the ring to make up a 4-7-membered ring, or Q is an --OR₁₅ group in which R₁₅ is alkyl, aryl, acyl or a heterocyclic radical.

Typical examples of customary yellow couplers are the compounds of the formulae below: ##STR29##

Further examples of yellow couplers are given in U.S. Pat. Nos. 2,407,210, 2,778,658, 2,875,057, 2,908,513, 2,908,573, 3,227,155, 3,227,550, 3,253,924, 3,265,506, 3,277,155, 3,408,194, 3,341,331, 3,369,895, 3,384,657, 3,415,652, 3,447,928, 3,551,155, 3,582,322, 3,725,072, 3,891,445, 3,933,501, 4,115,121, 4,401,752 and 4,022,620, in DE-A 1 547 868, 2 057 941, 2 162 899, 2 163 813, 2 213 461, 2 219 917, 2 261 361, 2 261 362, 2 263 875, 2 329 587, 2 414 006 and 2 422 812, in GB-A 1 425 020 and 1 077 874 and in JP-A 88/123 047 and in EP-A 447 969.

Typical and preferred yellow couplers conform to the formnulae: ##STR30##

Cyan couplers may be, for example, derivatives of phenol, of 1-naphthol or of pyrazoloquinazolone. Preference is given to structures of the formula E ##STR31## in which R₂₁, R₂₂, R₂₃ and R₂₄ are hydrogen, halogen, alkyl, carbamoyl, amino, sulfonamido, phosphoramido or ureido. R₂₁ is preferably H or Cl, R₂₂ is preferably an alkyl or amino group. R₂₃ is preferably an amino group and R₂₄ is preferably hydrogen. Q" is hydrogen or a leaving group which is eliminated during the reaction with the oxidized developer. A detailed list of cyan couplers is given in U.S. Pat. No. 4,456,681.

Further examples of cyan couplers are given in the following: U.S. Pat. Nos. 2,369,929, 2,423,730, 2,434,272, 2,474,293, 2,521,293, 2,521,908, 2,698,794, 2,706,684, 2,772,162, 2,801,171, 2,895,826, 2,908,573, 3,034,892, 3,046,129, 3,227,550, 3,253,294, 3,311,476, 3,386,301, 3,419,390, 3,458,315, 3,476,560, 3,476,563, 3,516,831, 3,560,212, 3,582,322, 3,583,971, 3,591,383, 3,619,196, 3,632,347, 3,652,286, 3,737,326, 3,758,308, 3,839,044, 3,880,661, 4 004,929, 4,124,396, 4,333,999, 4,463,086, 4,456,681, 4,873,183 and 4,923,791 and in EP-A 354 549 and EP-A 398 664.

The red-sensitive silver-halide emulsion layer of the material according to the invention preferably contains a cyan coupler of the formula ##STR32## and/or of the formula ##STR33## in which Z₁ is alkyl or aryl, Z₂ is alkyl, cycloalkyl, aryl, a heterocyclic group or a ballast group, Z₃ is hydrogen or halogen, Z₁ and Z₃ together can form a ring, and Z₄ is hydrogen or a leaving group, and Z₅ is a ballast group, Z₆ is hydrogen or a leaving group and Z₇ is alkyl.

Examples of customary cyan couplers are the following: ##STR34##

The colour developers usually used for colour-photographic materials are p-dialkylaminoanilines. Examples of these are 4-amino-N,N-diethylaniline, 3-methyl-4-amino-N,N-diethylaniline, 4-amino-N-ethyl-N-α-hydroxyethylaniline, 3-methyl-4-amino-N-ethyl-N-α-hydroxyethylaniline, 3-methyl-4-amino-N-ethyl-N-α-hydroxyethylaniline, 3-methyl-4-amino-N-ethyl-N-α-methanesulfonamidoethylaniline, 3-methyl-4-amino-N-ethyl-N-α-methoxyethylaniline, 3-α-methanesulfonamidoethyl-4-amino-N,N-diethylaniline, 3-methoxy-4-amino-N-ethyl-N-α-hydroxyethylaniline, 3-methoxy-4-amino-N-ethyl-N-α-methoxyethylaniline, 3-acetamido-4-amino-N,N-diethylaniline, 4-amino-N,N-dimethylaniline, N-ethyl-N-α- α'-(α"-methoxyethoxy)ethoxy!ethyl-3-methyl-4-aminoaniline, N-ethyl-N-α-(α'-methoxyethoxy)ethyl-3-methyl-4-aminoaniline, and the salts of these compounds, for example sulfates, hydrochlorides or toluenesulfonates.

The compounds of the formulae (Ia), (Ib) and (II) according to the invention, the magenta couplers and other colour couplers can be incorporated into the colour-photographic material in a known manner, for example into silver-halide emulsions which contain gelatin and/or other binders. They are used, for example, in silver-bromide, silver-chloride or silver-iodide emulsions or in emulsions which contain mixtures of silver halides, such as silver bromide/iodide or silver-chloride/bromide emulsions.

The compounds of the formulae (Ia), (Ib) and (II) according to the invention can be incorporated into the colour-photographic material together with the magenta coupler and if desired further additives by predissolving them in high-boiling organic solvents. Preference is given to solvents which boil higher than 160° C. Typical examples of these solvents are the esters of phthalic acid, phosphoric acid, citric acid, benzoic acid or fatty acids, and alkylamides and phenols.

A low-boiling solvent is usually used in addition in order to simplify incorporation of the additives into the colour-photographic material. Examples of such solvents are esters, for example ethyl acetate, alcohols, for example butanol, ketones, for example methyl isobutyl ketone, chlorinated hydrocarbons, for example methylene chloride, and amides, for example dimethylformamide. If the additives are themselves liquid, they can also be incorporated into the photographic material without the assistance of solvents.

The compounds according to the invention may if desired be dispersed in the gelatin layer as oil.

Further details on high-boiling solvents which can be used are given in the publications below:

Phosphates: GB-A 791 219, BE-A 755 248, JP-A 76/76 739, 78/27 449, 78/218 252, 78/97 573, 79/148 133, 82/216 177, 82/93 323 and 83/216 177 and EP-A 265 296.

Phthalates: GB-A 791 219, JP-A 77/98 050, 82/93 322, 82/216 176, 82/218 251, 83/24 321, 83/45 699 and 84/79 888.

Amides: GB-A 791 129, JP-A 76/105 043, 77/13 600, 77/61 089, 84/189 556, 87/239 149, EP-A 270 341 and WO 88/00 723.

Phenols: GB-A 820 329, FR-A 1 220 657, JP-A 69/69 946, 70/3818, 75/123 026, 75/82 078, 78/17 914, 78/21 166, 82/212 114 and 83/45 699.

Other oxygen-containing compounds: U.S. Pat. Nos. 3,748,141, 3,779,765, JP-A 73/75 126, 74/101 114, 74/10 115, 75/101 625, 76/76 740, 77/61 089, EP-A 304 810 and BE-A 826 039.

Other compounds: JP-A 72/115 369, 72/130 258, 73/127 521, 73/76 592, 77/13 193, 77/36 294, 79/95 233, 91/2748, 83/105 147 and Research Disclosure 82/21 918.

The amount of high-boiling solvent is, for example, in the range from 50 mg to 2 g per m² of base, preferably from 200 mg to 1 g per m².

The photographic layers may furthermore contain colour cast inhibitors. These prevent colour casts being formed, due, for example, to reaction of the coupler with unintentionally oxidized developer or with by-products of the colour-formation process. Colour cast inhibitors of this type are usually hydroquinine derivatives, but may also be derivatives of aminophenols, of gallic acid or of ascorbic acid. Typical examples of these inhibitors are given in the publications below: U.S. Pat. Nos. 2,360,290, 2,336,327, 2,403,721, 2,418,613, 2,675,314, 2,701,197, 2,704,713, 2,728,659, 2,732,300, 2,735,365; EP-A 124 877, EP-A 277 589, EP-A 338 785; JP-A 75/92 988, 75/92 989, 75/93 928, 75/110 337, 84/5247 and 77/146 235.

Photographic layers may also contain DIR couplers (DIR denotes Development Inhibition Release), which form colourless compounds with the oxidized developer. They are added to improve the sharpness and grain of the colour prints.

The photographic layers in the material according to the invention may also contain UV absorbers. These filter out the UV light and thus protect the dyes, the couplers and other components against photodegradation. Examples of such UV absorbers are 2-(2-hydroxyphenyl)benzotriazoles, 2-hydroxyphenyl-1,3,5-triazines, 2-hydroxybenzophenones, salicylic acid esters, acrylonitrile derivatives or thiazolines. UV absorbers of this type are described in greater detail, for example, in the following publications: U.S. Pat. Nos. 3,314,794, 3,352,681, 3,705,805, 3,707,375, 4,045,229, 3,700,455, 3,533,794, 3,698,907, 3,705,805, 3,738,837 and JP-A 71/2784. Preferred UV absorbers are the 2-(2-hydroxyphenyl)benzotriazoles (HBTs) of the formula ##STR35## in which T₁, T₂ and T₃, independently of one another, are hydrogen, halogen, alkyl, alkyl which is substituted by a carboxylate group, alkoxy, aryloxy, hydroxyl or acyloxy, and T₄ is hydrogen, alkoxy, aryloxy or acyloxy.

Particular preference is given to HBT compounds which are liquid at room temperature.

Examples of preferred HBT compounds are:

    ______________________________________                                          ##STR36##                                                                     HBT No.                                                                               T.sub.1        T.sub.4        T.sub.3                                   ______________________________________                                         HBT-1  H              CH.sub.3       H                                         HBT-2  H              C(CH.sub.3).sub.3                                                                             H                                         HBT-3  C(CH.sub.3).sub.3                                                                             CH.sub.3       Cl                                        HBT-4  C(CH.sub.3).sub.3                                                                             C(CH.sub.3).sub.3                                                                             Cl                                        HBT-5  C(CH.sub.3).sub.2 C.sub.2 H.sub.5                                                             C(CH.sub.3).sub.2 C.sub.2 H.sub.5                                                             H                                         HBT-6  CH(CH.sub.3)C.sub.2 H.sub.5                                                                   C(CH.sub.3).sub.3                                                                             H                                         HBT-7                                                                                  ##STR37##                                                                                     ##STR38##     H                                         HBT-8  C(CH.sub.3).sub.3                                                                             CH.sub.2 CH.sub.2 COOC.sub.8 H.sub.17                                                         Cl                                                              (isomers)                                                HBT-9  C(CH.sub.3).sub.3                                                                             CH.sub.2 CH.sub.2 COOC.sub.8 H.sub.17                                                         H                                                               (isomers)                                                HBT-10 C.sub.12 H.sub.25 (isomers)*                                                                  CH.sub.3       H                                         ______________________________________                                          *Principal product                                                       

Other preferred UV absorbers are 2-hydroxyphenyl-1,3,5-triazines of the formula ##STR39## in which R₁ is a group of the formula ##STR40## where R₄, R₅ and R₆, independently of one another, are hydrogen, C₁ -C₁₂ alkyl or halogen, or R₁ is a group of the formula ##STR41## and

R₂, R₃ and R₇, independently of one another, are monovalent organic radicals. R₂, R₃ and R₇ are preferably, independently of one another, a radical CH₂ CH(OR₈)CH₂ OR₉, where R₈ is hydrogen or acetyl, and R₉ is C₁ -C₁₈ alkyl.

The photographic layers may also contain phenolic compounds which act as light stabilizers for the colour image and as colour cast inhibitors. They may be present in a light-sensitive layer (colour layer) or in an intermediate layer, alone or together with other additives. Such compounds are described in greater detail, for example, in the publications below: U.S. Pat. Nos. 3,700,455, 3,591,381, 3,573,052, 4,030,931, 4,174,220, 4,178,184, 4,228,235, 4,279,990, 4,346,165, 4,366,226, 4,447,523, 4,528,264, 4,581,326, 4,562,146, 4,559,297, GB-A 1 309 277, 1 547 302, 2 023 862, 2 135 788, 2 139 370, 2 156 091; DE-A 2 301 060, 2 347 708, 2 526 468, 2 621 203, 3 323 448; DD-A 200 691, 214 468; EP-A 106 799, 113 124, 125 522, 159 912, 161 577, 164 030, 167 762, 176 845, 246 766, 320 776; JP-A 74/134 326, 76/127 730, 76/30 462, 77/3822, 77/154 632, 78/10 842, 79/48 535, 79/70 830, 79/73 032, 79/147 038, 79/154 325, 79/155 836, 82/142 638, 83/224 353, 84/5246, 84/72 443, 84/87 456, 84/192 246, 84/192 247, 84/204 039, 84/204 040, 84/212 837, 84/220 733, 84/222 836, 84/228 249, 86/2540, 86/8843, 86/18 835, 86/18 836, 87/11 456, 87/42 245, 87/62 157, 86/6652, 89/137 258 and in Research Disclosure 79/17 804.

The photographic layers may also contain certain phosphorus(III) compounds, in particular phosphites and phosphonites. These act as light stabilizers for the colour images and as dark-storage stabilizers for magenta couplers. They are preferably added to the high-boiling solvents together with the coupler. Phosphorus(III) compounds of this type are described in greater detail, for example, in the publications below: U.S. Pat. No. 4,407,935, U.S. Pat. No. 4,436,811, U.S. Pat. No. 4,956,406, EP-A 181 289, JP-A 73/32 728, JP-A 76/1420 and JP-A 55/66 741.

The photographic layers may also contain organometallic complexes which are light stabilizers for the colour images, in particular for the magenta dyes. Such compounds and combinations thereof with other additives are described in greater detail, for example, in the publications below: U.S. Pat. Nos. 4,050,938, 4,239,843, 4,241,154, 4,242,429, 4,241,155, 4,242,430, 4,273,854, 4,246,329, 4,271,253, 4,242,431, 4,248,949, 4,245,195, 4,268,605, 4,246,330, 4,269,926, 4,245,018, 4,301,223, 4,343,886, 4,346,165, 4,590,153; JP-A 81/167 138, 81/168 652, 82/30 834, 82/161 744; EP-A 137 271, 161 577, 185 506; DE-A 2 853 865.

The photographic layers may also contain hydroquinone compounds. These act as light stabilizers for the colour couplers and for the colour images and as scavengers of oxidized developer in the intermediate layers. They are used in particular in the magenta layer. Hydroquinone compounds of this type and combinations thereof with other additives are described in greater detail, for example, in the publications below: U.S. Pat. Nos. 2,360,290, 2,336,327, 2,403,721, 2,418,613, 2,675,314, 2,701,197, 2,710,801, 2,732,300, 2,728,659, 2,735,765, 2,704,713, 2,937,086, 2,816,028, 3,582,333, 3,637,393, 3,700,453, 3,960,570, 3,935,016, 3,930,866, 4,065,435, 3,982,944, 4,232,114, 4,121,939, 4,175,968, 4,179,293, 3,591,381, 3,573,052, 4,279,990, 4,429,031, 4,346,165, 4,360,589, 4,346,167, 4,385,111, 4,416,978, 4,430,425, 4,277,558, 4,489,155, 4,504,572, 4,559,297, FR-A 885 982; GB-A 891 158, 1 156 167, 1 363 921, 2 022 274, 2 066 975, 2 071 348, 2 081 463, 2 117 526, 2 156 091; DE-A 2 408 168, 2 726 283, 2 639 930, 2 901 520, 3 308 766, 3 320 483, 3 323 699; DD-A 216 476, 214 468, 214 469, EP-A 84 290, 110 214, 115 305, 124 915, 124 877, 144 288, 147 747, 178 165, 161 577; JP-A 75/33 733, 75/21 249, 77/128 130, 77/146 234, 79/0 036, 79/133 131, 81/83 742, 81/87 040, 81/109 345, 83/134 628, 82/22 237, 82/112 749, 83/17 431, 83/21 249, 84/75 249, 84/149 348, 84/182 785, 84/180 557, 84/189 342, 84/228 249, 84/101 650, 79/24 019, 79/25 823, 86/48 856, 86/48 857, 86/27 539, 86/6652, 86/72 040, 87/11 455, 87/62 157, and in Research Disclosure 79/17 901, 79/17 905, 79/18 813, 83/22 827 and 84/24 014.

The photographic layers may also contain further derivatives of hydroquinone ethers. These compounds act as light stabilizers and are particularly suitable for stabilizing magenta dyes. Such compounds and combinations thereof with other additives are described in greater detail, for example, in the publications below: U.S. Pat. Nos. 3,285,937, 3,432 300, 3,519,429, 3,476,772, 3,591,381, 3,573,052, 3,574,627, 3,573,050, 3,698,909, 3,764,337, 3,930,866, 4,113,488, 4,015,990, 4,113,495, 4,120,723, 4,155,765, 4,159,910, 4,178,184, 4,138,259, 4,174,220, 4,148,656, 4,207,111, 4,254,216, 4,134,011, 4,273,864, 4,264,720, 4,279,990, 4,332,886, 4,436,165, 4,360,589, 4,416,978, 4,385,111, 4,459,015, 4,559,297, 4,631,252, 4,616,082; GB-A 1 347 556, 1 366 441, 1 547 392, 1 557 237, 2 135 788; DE-A 3 214 567, 4 008 785, 4 012 305; DD-214 469, EP-A 161 577,167 762, 164 130, 176 845; JP-A 76/123 642, 77/35 633, 77/147 433, 78/126, 78/10 430, 78/53 321, 79/24 019, 79/25 823, 79/48 537, 79/44 521, 79/56 833, 79/70 036, 79/70 830, 79/73 032, 79/95 233, 79/145 530, 80/21 004, 80/50 244, 80/52 057, 80/70 840, 80/139 383, 81/30 125, 81/151 936, 82/34 552, 82/68 833, 82/204 306, 82/204 037, 83/134 634, 83/207 039, 84/60 434, 84/101 650, 84/87 450, 84/149 348, 84/182 785, 86/72 040, 87/11 455, 87/62 157, 87/63 149, 86/2151, 86/6652, 86/48 855, 89/309 058 and in Research Disclosure 78/17 051.

Preferred costabilizers are those of the formulae P, SA, SB, HQ and RE below.

Compounds of the formula P ##STR42## in which R₁ and R₂, independently of one another, are hydrogen, acyl or alkyl;

R_(a), R_(b) and R_(c), independently of one another, are H, alkyl, cycloalkyl, aryl, halogen, alkoxy, aroxy, acyloxy, alkylthio, arylthio, acyl, sulfonyl, sulfamoyl, acylamino, sulfonylamino or nitro;

A is a bond, S═ O!_(m), alkylene or --NR_(d) --;

R_(d) is alkyl or acyl; and

m is 0, 1 or 2.

Examples of compounds of the formula P are: ##STR43##

Compounds of the formula SA ##STR44## in which R₁ is hydrogen;

R₂ is phenyl or

R₁ and R₂ are methyl;

q is 0, 1 or 2; and

X is a divalent radical which supplements the ring of the formula SA to form a tetrahydrothiopyran ring.

Examples of compounds of the formula SA are those given in U.S. Pat. No. 4,993,271 and ##STR45##

Compounds of the formula SB

    R.sub.3 --S--(C.sub.p H.sub.2p)--Z--R.sub.4

in which

R₃ is alkyl, aryl or a (C_(p) H_(2p))--Z--R₄ group;

p is 1-12;

Z is --CO--O-- or --O--CO--; and

R₄ is a univalent, divalent, trivalent or tetravalent group.

Examples of compounds of the formula SB are: ##STR46##

Compounds of the formula HQ ##STR47## in which R_(e) and R_(d), independently of one another, are alkyl or cycloalkyl; and

R_(f) and R_(g), independently of one another, are as defined for R_(a), R_(b) and R_(c).

Examples of compounds of the formula HQ are: ##STR48##

Compounds of the formula RE ##STR49## in which R_(l) and R_(m), independently of one another, are H, acyl or alkyl; or R_(l) and R_(m) are bonded together to a P--O-aryl radical; and

R_(h), R_(i), R_(j) and R_(k), independently of one another, are as defined for R_(a), R_(b) and R_(c), with the proviso that at least one of the radicals R_(i) and R_(j) is not alkyl.

Examples of compounds of the formula RE are: ##STR50##

Silver-halide emulsions which can be used are conventional silver-chloride, silver-bromide or silver-iodide emulsions or mixtures thereof, such as silver-chlorobromide and silver-chloroiodide emulsions, in which the silver halides may have any known crystal form. The use of silver-chloride emulsions is particularly important in the material according to the invention. The preparation of such emulsions and the sensitization thereof are described in RESEARCH DISCLOSURE, November 1989, No. 307 105. This publication furthermore mentions a number of binders for said emulsions which can also be used in the materials according to the invention. The same applies to the bases mentioned in the publication.

The silver-halide emulsion which can be used for carrying out this invention can be sensitized for all desired wavelengths with the aid of sensitization pigments. For this purpose, it is possible to use cyanine pigments, merocyanine pigments, holopolar pigments, hemicyanine pigments, styryl pigments or hemioxanol pigments.

The photographic layers may furthermore contain conventional plasticizers, such as glycerol. The emulsions may also be cured by means of curing agents which are customary for gelatin. Finally, the emulsions may also contain customary coating auxiliaries.

The present invention thus furthermore relates to colour-photographic recording materials according to claim 1, which contain further organic stabilizers, UV absorbers, optical brighteners, light stabilizers, colour cast inhibitors and/or plasticizers.

The present invention also relates to compounds of the formula ##STR51## where k is the number 0 or 1;

p is a number from 1 to 18;

R₁ is hydrogen, C₁ -C₁₂ alkyl, C₁ -C₁₂ alkoxy, --COR₉, --COOR₁₀ or --Si(R₁₁)(R₁₂)(R₁₃);

in which R₉ is C₁ -C₈ alkyl, C₂ -C₁₈ alkenyl or phenyl;

R₁₀ is C₁ -C₄ alkyl or benzyl; and

R₁₁, R₁₂ and R₁₃, independently of one another, are C₁ -C₆ alkyl or phenyl;

R₂ is hydrogen, C₁ -C₁₈ alkyl, --OR₁₄ or --(CH₂)_(n) COOR₁₅ ;

in which n is a number from 0 to 17;

R₁₄ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, phenyl-C₁ -C₄ alkyl, C₃ -C₂₄ alkyl which is interrupted by one or more --O-- atoms, C₂ -C₁₄ hydroxyalkyl, phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen, or is tolyl, C₅ -C₆ cycloalkyl or --COR₁₆ ;

R₁₅ is C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl or phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen;

in which R₁₆ is C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl or phenyl; R₃, R₄, R₅ and R₆, independently of one another, are hydrogen, C₁ -C₁₂ alkyl, C₁ -C₈ alkoxy, C₅ -C₇ cycloalkyl, phenyl, phenyl-C₁ -C₄ alkyl or halogen;

R₇ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, phenyl-C₁ -C₄ alkyl, C₃ -C₂₄ alkyl, which is interrupted by one or more --O-- atoms, phenyl-C₁ -C₄ alkyl, phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen, or is benzyl, a group of the formula ##STR52## --CH₂ COOR₂₃ or --(CH₂ COO)_(k) CH₂ CH(OR₁)CH₂ R₁₇ ;

in which k is the number 0 or 1;

m is a number from 1 to 17;

R₁₇ is as defined for R₂ or is a group of the formula ##STR53## and R₂₃ is C₁ -C₈ alkyl;

R₈ is hydrogen, C₁ -C₁₈ alkyl or CH₂ R₂ ;

R₂₄ is --Si(R₁₁)(R₁₂)(R₁₃) or a group of the formula ##STR54## in which q is a number from 0 to 12; R₂₅ is hydrogen or C₁ -C₁₈ alkyl;

X₁ is O, S, SO, SO₂ or NR₁₈ ;

in which R₁₈ is hydrogen, C₁ -C₁₈ alkyl, --CH₂ CH(OH)CH₂ O(C₁ -C₁₄ alkyl) or

--CO--R₁₉ ;

in which R₁₉ is C₁ -C₁₈ alkyl; and

X₂ is CO, BR₂₀, PR₂₁, P(O)R₂₂, SO or SO₂ ;

in which R₂₀, R₂₁ and R₂₂ are C₁ -C₁₈ alkyl or phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen; and R₂₁ and R₂₂ may alternatively be phenoxy, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen;

where, in the case of compounds of the formula (Ia) R₂ may alternatively be a group of the formula ##STR55##

Preference is given to compounds of the formulae (Ia), (Ib) or (II),

where

k is the number 0 or 1;

p is a number from 2 to 12;

R₁ is hydrogen;

R₂ is C₁ -C₁₈ alkyl or --OR₁₄ ;

in which R₁₄ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₃ -C₂₄ alkyl which is interrupted by one or more --O-- atoms, phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl or C₁ -C₄ alkoxy, or is tolyl or C₅ -C₆ cycloalkyl;

R₃, R₄, R₅ and R₆, independently of one another, are hydrogen, C₁ -C₁₂ alkyl or C₁ -C₈ alkoxy;

R₇ is C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, a group of the formula ##STR56## --CH₂ COOR₂₃ or --(CH₂ COO)_(k) CH₂ CH(OR₁)CH₂ R₁₇ ;

in which k is the number 0 or 1;

m is a number from 1 to 17;

R₁₇ is as defined for R₂ or is a group of the formula ##STR57## and R₂₃ is C₁ -C₈ alkyl;

R₈ is hydrogen, C₁ -C₈ alkyl or CH₂ R₂ ;

R₂₄ is --Si(R₁₁)(R₁₂)(R₁₃) or a group of the formula ##STR58## in which q is a number from 0 to 6; R₁₁, R₁₂ and R₁₃, independently of one another, are C₁ -C₆ alkyl or phenyl; and

R₂₅ is hydrogen or C₁ -C₁₈ alkyl;

X₁ is O, S, SO₂ or NR₁₈ ;

in which R₁₈ is --CH₂ CH(OH)CH₂ O(C₁ -C₁₄ alkyl); and

X₂ is CO, BR₂₀, PR₂₁ or P(O)R₂₂ ;

in which R₂₀, R₂₁ and R₂₂ are phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, or C₁ -C₄ alkoxy; and

R₂₁ and R₂₂ may alternatively be phenoxy, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl or C₁ -C₄ alkoxy;

where, in the case of compounds of the formula (Ia), R₂ may alternatively be a group of the formula ##STR59##

Further preferred compounds are those mentioned in the description of the photographic material.

The novel compounds can be prepared by methods known per se, for example by reacting a compound of the formula ##STR60## with a glycidyl ether of the formula ##STR61## where X₃ is O or SO₂ and the radicals R₃, R₄, R₅, R₆ and R₁₄ are as defined in claim 1.

Novel compounds in which R₁ is not hydrogen can be prepared by further reaction with an acylating, agent or silylating agent.

Compounds of the formula II can be prepared, for example, by reacting a compound of the formula ##STR62## with ##STR63## to give ##STR64## which is then reacted with R₂₂ P(O)Cl₂, giving ##STR65## where the substituents are as defined in claim 1.

The dimeric compounds of the formula (Ia) or (II) can be prepared, for example, by reacting a compound of the formula (I^(o)) or the analogous compound (II^(o)) with a bisglycidyl compound of the formula ##STR66##

The examples below illustrate the invention in greater detail. In the examples and in the remainder of the description, parts are parts by weight, percentages are percent by weight and ##STR67## is a tert-butyl radical an analogous situation also applies to the other alkyl radicals!, unless otherwise stated.

EXAMPLE 1 Preparation of 1-morpholino-4- 2'hydroxy-3'-(2"ethylhexyloxy)!propyloxyphenyl

A mixture of 3 g (16.8 mmol) of 4-morpholinophenol, 3.75 g (20 mmol) of 2-ethylhexyl glycidyl ether and 124 mg (0.33 mmol) of ethyltriphenylphosphonium bromide is heated at 130° C. for 4 hours under nitrogen. The crude product is chromatographed over silica gel (ethyl acetate/hexane 6:4), giving 4.7 g (76%) of the compound as a colourless oil (m.p.<30° C.).

Elemental analysis: C₂₁ H₃₅ NO₄ Calculated: C 69.01; H 9.65; N 3.83% Found: C 68.79; H 9.79; N 3.89%

EXAMPLE 2 Preparation of 1-(2-dodecyloxy-tetradecyloxy)-3-(4-morpholin-4-yl-phenoxy)-propan-2-ol (101)

4-Morpholinyl-phenol (12.5 g, 70 mmol), mixture of dodecyl and tetradecyl glycidyl ether (19.7 g, 77 mmol) and ethyltriphenylphosphonium bromide (1.3 g, 3.5 mmol) are reacted as described for compound 100 and the crude product is crystalised from hexane to obtain a white solid 13.4 g (44%) m.p. 49°-52° C.

EXAMPLE 3 Preparation of 1- 4-(1,1-dioxo-thiomorpholin-4-yl)-phenoxy!-3-(2-ethylhexyloxy)-propan-2ol (102)

4-(1,1-dioxo-thiomorpholin-4-yl)phenol (4.1 g, 18 mmol), 2-ethylhexyl glycidyl ether (4.4 g, 23,6 mmol) and ethyltriphenylphosphonium bromide (0.37 g) are heated under nitrogen for 5 h at 145° C. and the crude product is chromatographed over silica gel (hexane/ethylacetate 1:1) to afford a colourless liquid 5.2 g (70%).

Anal. calcd. for C₂₁ H₃₅ NO₅ S C 60.99 H 8.53 N 3.39 C 61.00 H 8.61 N 3.45

EXAMPLE 4 Preparation of 1- 4-(1,1-dioxo-thiomorpholin-4-yl)-phenoxy!-3-(isotridecyloxy)-propan-2-ol (103)

4-(1,1-dioxo-thiomorpholin-4-yl)phenol (2.3 g, 10 mmol), isotridecylglycidyl ether (2.6 g, 10 mmol) and ethyltriphenylphosphonium bromide (0.1 g) are reacted and purified as described for compound 102 to afford a light yellow liquid 2.4 g (50%).

Anal. calcd. for C₂₆ H₄₅ NO₅ S C 64.56 H 9.38 N 2.90 C 64.50 H 9.27 N 2.95

EXAMPLE 5 Preparation of 1- 4-(1,1-dioxo-thiomorpholin-4-yl)-phenoxy!-3-(t-butyloxy)-propan-2-ol (104)

4-(1,1-dioxo-thiomorpholin-4-yl)phenol (2.3 g, 10 mmol), t-butylglycidyl ether (1.56 g, 12 mmol) and ethyltriphenylphosphonium bromide (0.1 g) are reacted and purified as described for compound 102 to afford a light yellow liquid 2.8 g (78%).

EXAMPLE 6 Preparation of 1- 4-(1,1-dioxo-thiomorpholin-4-yl)-phenoxy!-3-(isooctyloxy)-propan-2-ol (105)

4-(1,1-dioxo-thiomorpholin-4-yl)phenol (2.3 g, 10 mmol), isooctylglycidyl ether (1.9 g, 10 mmol) and ethyltriphenylphosphonium bromide (0.2 g) are reacted and purified as described for compound 102 to afford a light yellow liquid 2.85 g (69%).

EXAMPLE 7 Preparation of 1- 4-(1,1-dioxo-thiomorpholin-4-yl)-phenoxy!-3-(3,5,5-trimethylhexyloxy)-propan-2-ol (106)

4-(1,1-dioxo-thiomorpholin-4-yl)phenol (2.3 g, 10 mmol), 3,5,5-trimethylhexylglycidyl ether (2 g, 10 mmol) and ethyltriphenylphosphonium bromide (0.1 g) are reacted and purified as described for compound 102 to afford a light yellow liquid 2.8 g (65%).

EXAMPLE 8 Preparation of 1- 4-(1,1-dioxo-thiomorpholin-4-yl)-phenoxy!-3-(isodecylox)-propan-2-ol (107)

4-(1,1-dioxo-thiomorpholin-4-yl)phenol (2.3 g, 10 mmol), isodecylglycidyl ether (2.15 g, 10 mmol) and ethyltriphenylphosphonium bromide (0.2 g) are reacted and purified as described for compound 102 to afford a light yellow liquid 2.3 g (52%).

Anal. calcd. for C₂₃ H₃₉ NO₅ S C 62.55 H 8.90 N 3.17 C 62.58 H 8.86 N 3.24

EXAMPLE 9 Preparation of 1- 4-(1,1-dioxo-thiomorpholin-4-yl)-phenoxy!-3-(isododecyloxy)-propan-2-ol (108)

4-(1,1-dioxo-thiomorpholin-4-yl)phenol (2.3 g, 10 mmol), isodecylglycidyl ether (2.4 g, 10 mmol) and ethyltriphenylphosphonium bromide (0.2 g) are reacted and purified as described for compound 102 to afford a light yellow liquid 1.4 g (30%).

Anal. calcd. for C₂₅ H₄₃ NO₅ S C 63.93 H 9.23 N 2.98 C 63.97 H 9.06 N 2.99

EXAMPLE 10 Preparation of 1- 4-(1,1-dioxo-thiomorpholin-4-yl)-phenoxy!-3-(dodecyloxy-tetradecyloxy)-propan-2-ol (109)

4-(1,1-dioxo-thiomorpholin-4-yl)phenol (2.3 g, 10 mmol), a mixture of dodecyl/tridecyl/tetradecylglycidyl ether (2.6 g, 10 mmol) and ethyltriphenylphosphonium bromide (0.1 g) are reacted and purified as described for compound 102 to afford a light yellow liquid 2.14 g (45%).

EXAMPLE 11 Preparation of 1- 4-(1,1-dioxo-thiomorpholin-4-yl)-phenoxy!-3-(phenoxy)-propan-2-ol (110)

4-(1,1-dioxo-thiomorpholin-4-yl)phenol (2.3 g, 10 mmol), phenylglycidyl ether (1.5 g, 10 mmol) and ethyltriphenylphosphonium bromide (0.1 g) are reacted and purified as described for compound 102 to afford a light yellow liquid 2.2 g (58%).

EXAMPLE 12 Preparation of 1- 4-(1,1-dioxo-thiomorpholin-4-yl)-phenoxy!-3-(2,2-dimethylhexanol)-propan-2-ol (111)

4-(1,1-dioxo-thiomorpholin-4-yl)phenol (2.3 g, 10 mmol), 2,2-dimethyl-hexanoylglycidyl ether (2.3 g, 10 mmol) and ethyltriphenylphosphonium bromide (0.2 g) are reacted and purified (dioxane/hexane 1:1, eluent) as described for compound 102 to afford a light yellow liquid 3.6 g (79%).

EXAMPLE 13 Preparation of 1- 4-(1,1-dioxo-thiomorpholin-4-yl)-phenoxy!-3-(nonyl)-propan-2-ol (112)

4-(1,1-dioxo-thiomorpholin-4-yl)phenol (2.3 g, 10 mmol), 2-(decyl)-oxirane (1.9 g, 10 mmol) and ethyltriphenylphosphonium bromide (0.2 g) are reacted and purified as described for compound 102 to afford a light brown solid 1.6 g (38%), m.p. 84° C.

EXAMPLE 14 Preparation of 1- 4-(1,1-dioxo-thiomorpholin-4-yl)-phenoxy!-3-(2,2,4-trimethyl-3-hydroxy-pentyloxy)-propan-2-ol (114)

4-(1,1-dioxo-thiomorpholin-4-yl)phenol (1.13 g, 5 mmol), 2,2,4-trimethyl-3-hydroxy-pentyloxyglycidyl ether (1.0 g, 5 mmol) and ethyltriphenylphosphonium bromide (0.1 g) are reacted and purified as described for compound 102 to afford a light yellow liquid 0.86 g (40%).

EXAMPLE 15 Preparation of 1- 3-(3,5-di t-butyl-4-hydroxy-phenyl)-propane-carboxy)-2-(4-morpholin-4-yl phenoxy)-ethane (118)

2-(4-Morpholinyl-phenoxy)-ethanol (1.12 g, 5 mmol), methyl 3,5-di t-butyl-4-hydroxyphenyl propionic acid (1.38 g, 5 mmol) and dibutyltinoxide (0.12 g, 0,5 mmol in xylene (30 ml)) are heated at 140° C. under nitrogen for 5 h and the crude product is chromatographed over silicagel (ethyl acetate/hexane, 3:7) to obtain a white solid 0.5 g (21%) m.p. 105°-109° C.

EXAMPLE 16 Preparation of 1- 3-(3-t-butyl-5-methyl-4-hydroxy-phenyl)-propane-carboxy)-2-(4-morpholin-4-yl phenoxy)-ethane (119)

2-(4-Morpholinyl-phenoxy)-ethanol (1.12 g, 5 mmol), methyl 3-t-butyl-5-methyl-4-hydroxyphenyl propionic acid (1.25 g, 5 mmol) and dibutyltinoxide (0.12 g, 0,5 mmol in xylene (30 ml)) are heated at 140° C. under nitrogen and the product is purified as described for compound 118 to obtain a light yellow oil 1.72 g (78%).

EXAMPLE 17 Preparation of 4,8-bis-butoxymethyl-6-(4-dodecyloxy-phenyl)-2-phenyl- 1,3,6,2!dioxazaphosphocane-2-oxide (200)

To a solution of 4-dodecyloxy-N,N-di(2-hydroxy-3-butoxy)-propyl aniline (5.38 g, 10 mmol), pyridine (3 g, 30 mmol) and dimethylaminopyridine (0.2 g) in dichloromethane (20 ml) is added a solution of phenylphosphonous dichloride (2.14 g, 11 mmol) in dichloromethane (5 ml) at 0° C. and then stirred at room temperature for 6 h. After treating with water, the crude product is purified over silicagel (ethyl acetate/hexane, 1:1) to afford a light yellow solid 1.2 g (18%, compound 200) and a white solid 1.3 g (20%, another isomer).

EXAMPLE 18 Preparation of 4,8-bis-butoxymethyl-6-(4-dodecyloxy-phenyl)-2-phenoxy- 1,3,6,2!dioxazaphosphocane-2-oxide (201)

It is prepared from 4-dodecyloxy-N,N-di(2-hydroxy-3-butoxy)-propyl aniline (5.38 g, 10 mmol), pyridine (3 g, 30 mmol), dimethylaminopyridine (0.2 g) and phenylphosphonic dichloride (2.32 g, 11 mmol) in dichloromethane as described for compound 200 to obtain a white solid 1.44 g (21%) and its isomer 1.4 g (20% a white solid).

EXAMPLE 19 Preparation of 6-(4-dodecyloxy-phenyl)-2-phenyl- 1,3,6,2!dioxazaphosphocane-2-oxide (202)

It is prepared from 4-dodecyloxy-N,N-di(2-hydroxy)ethyl aniline (3.66 g, 10 mmol), pyridine (2 g, 25 mmol), dimethylaminopyridine (0.2 g) and phenylphosphonous dichloride (2.15 g, 11 mmol) in dichloromethane as described for compound 200 to obtain a white solid 1 g (21%).

EXAMPLE 20 Preparation of 6-(4-dodecyloxy-phenyl)-2-phenoxy- 1,3,6,2!dioxazaphosphocane-2-oxide (203)

It is prepared from 4-dodecyloxy-N,N-di(2-hydroxy)-ethyl aniline (3.66 g, 10 mmol), pyridine (2 g, 25 mmol), dimethylaminopyridine (0.2 g) and phenylphosphonic dichloride (2.11 g, 10 mmol) in dichloromethane as described for compound 200 to obtain a white solid 1.3 g (25%).

EXAMPLE 21 Preparation of 6-(4-methoxy-phenyl)-2-phenoxy- 1,3,6,2!dioxazaphosphocane-2-oxide (204)

It is prepared from 4-methoxy-N,N-di(2-hydroxy)-ethyl aniline (2.1 g, 10 mmol), pyridine (2 g, 25 mmol), dimethylaminopyridine (0.2 g) and phenylphosphonic dichloride (2.11 g, 10 mmol) in dichloromethane as described for compound 200 to obtain a white solid 1.2 g (34%); m.p. 124°-126° C.

EXAMPLE 22 Preparation of 4,8-bis-butoxymethyl-6-(4-methoxy-phenyl)-2-phenoxy- 1,3,6,2!dioxazaphosphocane-2-oxide (205)

It is prepared from 4-methoxy-N,N-di(2-hydroxy-3-butoxy)-propyl aniline (1.91 g, 5 mmol), pyridine (1,2 g, 15 mmol), dimethylaminopyridine (0.2 g) and phenylphosphonic dichloride (1.1 g, 5.1 mmol) in dichloromethane as described for compound 200 to obtain a pale yellow liquid 0.4 g (16%) and its isomer 0.5 g (19% a pale yellow liquid).

EXAMPLE 23 Preparation of 4,8-bis-butoxymethyl-6-(4-methoxy-phenyl)-2-phenyl- 1,3,6,2!dioxazaphosphocane-2-oxide (206)

It is prepared from 4-methoxy-N,N-di(2-hydroxy-3-butoxy)-propyl aniline (1.91 g, 5 mmol), pyridine (1,2 g, 15 mmol), dimethylaminopyridine (0.2 g) and phenylphosphonous dichloride (1 g, 5.1 mmol) in dichloromethane as described for compound 200 to obtain a colourless liquid 0.6 g (24%) and its isomer 0.6 g (24% a colourless liquid).

EXAMPLE 24 Preparation of 4,8-bis-(2-ethyl-hexyloxymethyl)-6-(4-dodecyloxy-phenyl)-2-phenyl- 1,3,6,2!dioxazaphosphocane-2-oxide (207)

It is prepared from 4-methoxy-N,N-di(2-hydroxy-3-ethyl-hexyloxy)-propyl aniline (2 g, 4 mmol), pyridine (0,8 g, 10 mmol), dimethylaminopyridine (0.2 g) and phenylphosphonous dichloride (0.8 g, 4 mmol) in dichloromethane as described for compound 200 to obtain a pale yellow liquid 0.8 g (32%) and its isomer 0.85 g (34%, a pale yellow liquid).

EXAMPLE 25 Preparation of 6-(4-dodecyloxy-phenyl)- 1,3,6,2!dioxthiazocane-2-oxide (208)

It is prepared from 4-dodecyloxy-N,N-di(2-hydroxy)-ethyl aniline (1.8 g, 5 mmol), pyridine (0,95 g, 6 mmol), dimethylaminopyridine (0.2 g) and thionyl chloride (0.72 g, 6 mmol) in dichloromethane as described for compound 200 to obtain a white solid 1.1 g (53%).

Anal. calcd. for C₂₂ H₃₇ NO₄ S C 64.20 H 9.06 N 3.40 S 7.79 C 63.99 H 9.07 N 3.30 S 7.85

EXAMPLE 26

A polyethylene-coated base material is coated with a gelatin layer containing silver bromide, magenta coupler (M-11) and a stabilizer.

The gelatin layer contains the following components (per m² of base material):

                  TABLE 1                                                          ______________________________________                                         Component             AgBr layer                                               ______________________________________                                         Gelatin               5.10   g                                                 Curing agent          300    mg                                                Wetting agent         85     mg                                                Silver bromide        260    mg                                                Magenta coupler       305    mg                                                Tricresyl phosphate   305    mg                                                Stabilizer            229    mg                                                ______________________________________                                    

The stabilizer is used either alone or as a mixture with a costabilizer, in which case the stabilizer:costabilizer ratio is 4.5:3.5; the total amount of stabilizer remains constant.

The curing agent used is 2,4-dichloro-6-hydroxytriazine, and the wetting agent used is the sodium salt of diisobutylnaphthalenesulfonic acid.

A step wedge having a density difference of 0.15 logE per step is exposed onto each of the resultant samples, which are subsequently processed in accordance with the manufacturer's instructions by the Kodak EP2 process for colour negative papers.

After exposure and processing, the remission density in green for the magenta step is measured at a density between 0.9 and 1.1 of the wedge. The wedge is then exposed behind a UV absorber filter in an Atlas exposure unit with 15 kJ/cm², and the remission density is re-measured. The drop in magenta dye density (-ΔD) is greatly reduced in the presence of the stabilizers compared with a sample containing no stabilizer (Table 1a to 1c).

                  TABLE 1a                                                         ______________________________________                                         % dye loss                                                                              with costabilizer                                                     stabilizer alone         P1     P2                                             ______________________________________                                         no         50                                                                  100        13            7      10                                             101        12            8      10                                             102        13            8      11                                             103        12            7      10                                             104        33            13     18                                             105        15            8      12                                             106        13            8      11                                             107        11            6      10                                             108        12            6       9                                             109        13            8      10                                             111        10            7      11                                             112        16            7      11                                             114        44            11     21                                             118        15            9      13                                             119        11            7      10                                             ______________________________________                                    

                  TABLE 1b                                                         ______________________________________                                         % dye loss                                                                               with costabilizer                                                    stabilizer  alone         P1    P2                                             ______________________________________                                         no stabilizer                                                                              55                                                                 200         20            10    15                                             201         22            11    17                                             202         23            11    16                                             203         22            12    15                                             204         21             9    16                                             205         21             9    14                                             206         20             9    16                                             207         21            12    14                                             208         27            15    19                                             ______________________________________                                    

                  TABLE 1c                                                         ______________________________________                                         % dye loss                                                                             with costabilizer                                                      stabilizer                                                                               alone     SA1    SB3    HQ6  RE9                                     ______________________________________                                         no stabilizer                                                                            57                                                                   100       13        9      11     13   12                                      102        9        8      12     13   10                                      203       19        17     19     18   19                                      ______________________________________                                    

EXAMPLE 27

A polyethylene-coated base material is coated with a gelatin layer containing silver bromide, magenta coupler (M-5) and a stabilizer.

The gelatin layer contains the following components (per m² of base material):

                  TABLE 2                                                          ______________________________________                                         Component             AgBr layer                                               ______________________________________                                         Gelatin               5.l0   g                                                 Curing agent          300    mg                                                Wetting agent         85     mg                                                Silver bromide        260    mg                                                Magenta coupler       306    mg                                                Tricresyl phosphate   612    mg                                                Stabilizer            107    mg                                                ______________________________________                                    

The stabilizer is used either alone or as a mixture with a costabilizer, in which case the stabilizer:costabilizer ratio is 1:1; the total amount of stabilizer remains constant.

The curing agent used is 2,4-dichloro-6-hydroxytriazine, and the wetting agent used is the sodium salt of diisobutylnaphthalenesulfonic acid.

A step wedge having a density difference of 0.15 logE per step is exposed onto each of the resultant samples, which are subsequently processed in accordance with the manufacturer's instructions by the Kodak EP2 process for colour negative papers.

After exposure and processing, the remission density in green for the magenta step is measured at a density between 0.9 and 1.1 of the wedge. The wedge is then exposed behind a UV absorber filter in an Atlas exposure unit with 30 kJ/cm², and the remission density is re-measured. The drop in magenta dye density (-ΔD) is greatly reduced in the presence of the stabilizers compared with a sample containing no stabilizer Table 2a and 2b).

                  TABLE 2a                                                         ______________________________________                                         % dye loss                                                                              with costabilizer                                                     stabilizer alone          P1    P2                                             ______________________________________                                         no         45                                                                  100        12             12    20                                             101        11             12    19                                             102        10             14    23                                             103        10             11    22                                             104        28             29    34                                             105        12             14    22                                             106        10             13    23                                             107        10             11    22                                             108        10             13    22                                             109        10             13    23                                             110        35             32    38                                             111        10             12    26                                             112         9              9    21                                             114        41             32    38                                             118        18             17    25                                             119        12             16    22                                             ______________________________________                                    

                  TABLE 2b                                                         ______________________________________                                         % dye loss                                                                              with costabilizer                                                     stabilizer alone          P1    P2                                             ______________________________________                                         no         45                                                                  200        21             17    28                                             201        23             16    29                                             202        21             13    23                                             203        22             14    27                                             204        19             17    29                                             205        21             13    26                                             206        23             12    28                                             207        18             15    27                                             208        33             15    26                                             ______________________________________                                     

What is claimed is:
 1. A colour-photographic recording material which comprises a magenta coupler and, as stabilizer, at least one compound of the formula ##STR68## where k is the number 0 or 1;R₁ is hydrogen, C₁ -C₁₂ alkyl, C₁ -C₁₂ alkoxy, --COR₉, --COOR₁₀ or --Si(R₁₁)(R₁₂)(R₁₃);in which R₉ is C₁ -C₈ alkyl, C₂ -C₁₈ alkenyl or phenyl; R₁₀ is C₁ -C₄ alkyl or benzyl; and R₁₁, R₁₂ and R₁₃, independently of one another, are C₁ -C₆ alkyl or phenyl; R₂ is hydrogen, C₁ -C₁₈ alkyl, --OR₁₄ or --(CH₂)_(n) COOR₁₅ ;in which n is a number from 0 to 17; R₁₄ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, phenyl-C₁ -C₄ alkyl, C₃ -C₂₄ alkyl which is interrupted by one or more --O-- atoms, C₂ -C₁₄ hydroxyalkyl, phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen, or is tolyl, C₅ -C₆ cycloalkyl or --COR₁₆ ; R₁₅ is C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl or phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen;in which R₁₆ is C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl or phenyl; R₃, R₄, R₅ and R₆, independently of one another, are hydrogen, C₁ -C₁₂ alkyl, C₁ -C₈ alkoxy, C₅ -C₇ cycloalkyl, phenyl, phenyl-C₁ -C₄ alkyl or halogen; X₁ is O, S, SO, SO₂ or NR₁₈ ;in which R₁₈ is hydrogen, C₁ -C₁₈ alkyl, --CH₂ CH(OH)CH₂ O(C₁ -C₁₄ alkyl) or --CO--R₁₉ ;in which R₁₉ is C₁ -C₁₈ alkyl; andwhere, in the case of compounds of the formula (Ia) R₂ may alternatively be a group of the formula ##STR69##
 2. A color-photographic recording material according to claim 1, which comprises, as stabilizer, at least one compound of the formula (Ia)where k is the number 0 or 1; R₁ is hydrogen; R₂ is C₁ -C₁₈ alkyl or --OR₁₄ ;in which R₁₄ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₃ -C₂₄ alkyl which is interrupted byone or more --O-- atoms, phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl or C₁ -C₄ alkoxy, or is tolyl or C₅ -C₆ cycloalkyl; R₃, R₄, R₅ and R₆, independently of one another, are hydrogen, C₁ -C₁₂ alkyl or C₁ -C₈ alkoxy; X₁ is O, S, SO, SO₂ or NR₁₈ ;in which R₁₈ is --CH₂ CH(OH)CH₂ O(C₁ -C₁₄ alkyl); andwhere, in the case of compounds of the formula (Ia), R₂ may alternatively be a group of the formula ##STR70##
 3. A color-photographic recording material according to claim 1, which contains further organic stabilizers, UV absorbers, optical brighteners, light stabilizers, colour cast inhibitors and/or plasticizers.
 4. A color-photographic recording material according to claim 3, which comprises, as further organic stabilizers, a compound of the formula P ##STR71## in which R₁ and R₂, independently of one another, are hydrogen, acyl or alkyl;R_(a), R_(b) and R_(c), independently of one another, are H, alkyl, cycloalkyl, aryl, halogen, alkoxy, aroxy, acyloxy, alkylthio, arylthio, acyl, sulfonyl, sulfamoyl, acylamino, sulfonylamino or nitro; A is a bond, S═ O!_(m), alkylene or NR_(d) ; R_(d) is alkyl or acyl; and m is 0, 1 or 2;or a compound of the formula SA ##STR72## in which R₁ is hydrogen; R₂ is phenyl or R₁ and R₂ are methyl; q is 0, or 2; and X is a divalent radical which supplements the ring of the formula SA to form a tetrahydrothiopyran ring;or a compound of the formula SB

    R.sub.3 --S--(C.sub.p H.sub.2p)--Z--R.sub.4

in which R₃ is alkyl, aryl or a (C_(p) H_(2p))--Z--R₄ group; p is 1-12; Z is --CO--O-- or --O--CO--; and R₄ is a univalent, divalent, trivalent or tetravalent group;or a compound of the formula HQ ##STR73## in which R_(e) and R_(d), independently of one another, are alkyl or cycloalkyl; and R_(f) and R_(g), independently of one another, are as defined for R_(a), R_(b) and R_(c) ;or a compound of the formula RE ##STR74## in which R_(l) and R_(m), independently of one another, are H, acyl or alkyl; or R_(l) and R_(m) are bonded together to a P--O-aryl radical; and R_(h), R_(i), R_(j) and R_(k), independently of one another, are as defined for R_(a), R_(b) and R_(c), with the proviso that at least one of the radicals R_(i) and R_(j) is not alkyl.
 5. A compound of the formula ##STR75## where k is the number 0or 1;R₁ is hydrogen, C₁ -C₁₂ alkyl, C₁ -C₁₂ alkoxy, --COR₉, --COOR₁₀ or --Si(R₁₁)(R₁₂)(R₁₃);in which R₉ is C₁ -C₈ alkyl, C₂ -C₁₈ alkenyl or phenyl; R₁₀ is C₁ -C₄ alkyl or benzyl; and R₁₁, R₁₂ and R₁₃, independently of one another, are C₁ -C₆ alkyl or phenyl; R₂ is hydrogen, C₁ -C₁₈ alkyl, --OR₁₄ or --(CH₂)_(n) COOR₁₅ ;in which n is a number from 0 to 17; R₁₄ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, phenyl-C₁ -C₄ alkyl, C₃ -C₂₄ alkyl which is interrupted by one or more --O-- atoms, C₂ -C₁₄ hydroxyalkyl, phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen, or is tolyl, C₅ -C₆ cycloalkyl or --COR₁₆ ; R₁₅ is C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl or phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl, C₁ -C₄ alkoxy or halogen;in which R₁₆ is C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl or phenyl; R₃, R₄, R₅ and R₆, independently of one another, are hydrogen, C₁ -C₁₂ alkyl, C₁ -C₈ alkoxy, C₅ -C₇ cycloalkyl, phenyl, phenyl-C₁ -C₄ alkyl or halogen; X₁ is O, S, SO, SO₂ or NR₁₈ ;in which R₁₈ is hydrogen, C₁ -C₁₈ alkyl, --CH₂ CH(OH)CH₂ O(C₁ -C₁₄ alkyl) or --CO--R₁₉ ;in which R₁₉ is C₁ -C₁₈ alkyl; andwhere, in the case of compounds of the formula (Ia) R₂ may alternatively be a group of the formula ##STR76##
 6. A compound according to claim 5,where k is the number 0 or 1; R₁ is hydrogen; R₂ is C₁ -C₁₈ alkyl or --OR₁₄ ;in which R₁₄ is hydrogen, C₁ -C₁₈ alkyl, C₂ -C₁₈ alkenyl, C₃ -C₂₄ alkyl which is interrupted by one or more --O-- atoms, phenyl, which may be monosubstituted to trisubstituted by C₁ -C₄ alkyl or C₁ -C₄ alkoxy, or is tolyl or C₅ -C₆ cycloalkyl; R₃, R₄, R₅ and R₆, independently of one another, are hydrogen, C₁ -C₁₂ alkyl or C₁ -C₈ alkoxy; X₁ is O, S, SO, SO₂ or NR₁₈ ;in which R₁₈ is --CH₂ CH(OH)CH₂ O(C₁ -C₁₄ alkyl); andwhere, in the case of compounds of the formula (Ia), R₂ may alternatively be a group of the formula ##STR77##
 7. A compound according to claim 5,where k is the number 0; R₁ is hydrogen; R₂ is --OR₁₄ ;in which R₁₄ is C₁ -C₁₈ alkyl, C₃ -C₂₄ alkyl which is interrupted by one or more --O-- atoms, or phenyl; R₃, R₄, R₅ and R₆ are hydrogen; X₁ is O or SO₂.
 8. A compound according to claim 5, of the formula ##STR78## where k is the number 0;R₁ is hydrogen; R₂ is --OR₁₄ ;in which R₁₄ is C₁ -C₁₄ alkyl or phenyl; R₃, R₄, R₅ and R₆ are hydrogen; X₁ is O or SO₂ ; and X₁ is O or SO₂.
 9. A process for stabilizing magenta couplers and/or magenta dyes in color-photographic materials, in which a stabilizer according to claim 1 is incorporated into the material. 